HydroBASINS lev08 watershed · #2080589050
Bassin de Ruisseau de Medas
A watershed (drainage basin) is not a body of water — it is the land area where rainfall converges towards a single river that eventually reaches the sea (or an endorheic basin). Boundaries follow ridgelines.
Crosses 1 administrative regions : Ariège
Sub-basin area
32,8km²
Upstream area
717,6km²
Discharge
7,31m³/s
Mean elev.
870m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de l'Ariège520 km²
- Bassin de l'Aston164 km²
14 communes (GADM L5)Available for FRA, RWA
- Ornolac-Ussat-les-Bains10.42 km²83% commune
- Larnat5.00 km²98% commune
- Ussat3.93 km²100% commune
- Sinsat3.93 km²100% commune
- Bouan3.31 km²100% commune
- Verdun2.09 km²18% commune
- Larcat1.09 km²11% commune
- Tarascon-sur-Ariège1.04 km²11% commune
- Aulos0.94 km²98% commune
- Niaux0.61 km²15% commune
- Arnave0.21 km²3% commune
- Miglos0.20 km²1% commune
- Les Cabannes0.13 km²17% commune
- Château-Verdun0.00 km²0% commune
5 intersecting protected areas
Special Protection Area (Birds Directive)
15.10 km² overlap
Special Areas of Conservation (Habitats Directive)
15.10 km² overlap
Falaises dites \'du Quié\'
IUCN IVBiotope Protection Order
3.28 km² overlap
Pyrénées Ariégeoises
IUCN VRegional Nature Park
0.67 km² overlap
Garonne, Ariège, Hers, Salat, Pique et Neste
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.34 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 445 distinct species · 26 535 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 32 species (selected proportionally per kingdom among those with at least one documented interaction here) to keep the graph readable. Hover for details, click to explore the full ecosystem of a species.
ℹ️ The territory contains many more species than displayed and all their documented interactions: the graph is intentionally the structural skeleton (top-N species by composite local score, edges filtered by Serrano 2009 disparity filter α=0.2).
Indicateurs du tissu écologique
Tissu écologique de Bassin de Ruisseau de Medas : 27 espèces + 5 bulles famille, 60 interactions GloBI documentées sur 5 types (connectance 12.1%, filtre Serrano α=0.2). Les 5 bulles regroupent des espèces visuellement absorbées par famille (≥3 espèces visibles).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
10,1°C
Annual rain
892mm
Moisture idx (CMI)
0,04
Runoff
330mm/an
PET
845mm
AET
692mm
Mean slope
23,7°
Water table
851cm
Forest
100%
Crops
2%
Urban
0%
Protected
12%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)